40 CFR § 421.204 - Standards of performance for new sources.
---identifier: "/us/cfr/t40/s421.204"source: "ecfr"legal_status: "authoritative_unofficial"title: "40 CFR § 421.204 - Standards of performance for new sources."title_number: 40title_name: "Protection of Environment"section_number: "421.204"section_name: "Standards of performance for new sources."chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"subchapter_number: "N"subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"part_number: "421"part_name: "NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY"positive_law: falsecurrency: "2026-04-05"last_updated: "2026-04-05"format_version: "1.1.0"generator: "[email protected]"authority: "Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4."regulatory_source: "49 FR 8790, Mar. 8, 1984, unless otherwise noted."cfr_part: "421"---
Identifier
/us/cfr/t40/s421.204
Currency
2026-04-05
Positive Law
No
Updated
2026-04-05
Chapter
Environmental Protection Agency
Authority
Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water A... Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 (b) and (c), 308 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) and the Water Quality Act of 1987 (the “Act”); 33 U.S.C. 1311, 1314 (b), (c), (e), and (g), 1316 (b) and (c), 1317 (b) and (c), 1318 and 1361; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217; 101 Stat. 7, Pub. L. 100-4.
# 421.204 Standards of performance for new sources.Any new source subject to this subpart shall achieve the following new source performance standards:(a) Spent battery electrolyte.NSPS for the Secondary Mercury Subcategory| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average || --- | --- | --- || | mg/kg (pounds per million pounds) of mercury produced from batteries | || Lead | 0.030 | 0.014 || Mercury | 0.016 | 0.006 || Total suspended solids | 1.590 | 1.272 || pH | () | () || Within the range of 7.5 to 10.0 at all times. | | |(b) Acid wash and rinse water.NSPS for the Secondary Mercury Subcategory| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average || --- | --- | --- || | mg/kg (pounds per million pounds) of mercury washed and rinsed | || Lead | 0.00056 | 0.00026 || Mercury | 0.00030 | 0.00012 || Total suspended solids | 0.03000 | 0.02400 || pH | () | () || Within the range of 7.5 to 10.0 at all times. | | |(c) Furnace wet air pollution control.NSPS for the Secondary Mercury Subcategory| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average || --- | --- | --- || | mg/kg (pounds per million pounds) of mercury processed through furnace | || Lead | 0.000 | 0.000 || Mercury | 0.000 | 0.000 || Total suspended solids | 0.000 | 0.000 || pH | () | () || Within the range of 7.5 to 10.0 at all times. | | |